Hadith on Speech: All of the body parts of the son of Adam bow to his tongue

Abu Sa’id Al-Khudri reported: The Messenger of Allah صلى الله عليه وسلم said, “When the son of Adam wakes up, all of his body parts bow to the tongue and say: Fear Allah concerning us, we are only part of you. If you are upright, then we are upright; but if you are crooked, then we are crooked.”
[Sunan At-Tirmidhi, Book of Asceticism, Number 2407, Hasan]

عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ رَفَعَهُ قَالَ  إِذَا أَصْبَحَ ابْنُ آدَمَ فَإِنَّ الْأَعْضَاءَ كُلَّهَا تُكَفِّرُ اللِّسَانَ فَتَقُولُ اتَّقِ اللَّهَ فِينَا فَإِنَّمَا نَحْنُ بِكَ فَإِنْ اسْتَقَمْتَ اسْتَقَمْنَا وَإِنْ اعْوَجَجْتَ اعْوَجَجْنَا

سنن الترمذي كتاب الزهد عن رسول الله صلى الله عليه وسلم باب ما جاء في حفظ اللسان